Feed-water heater



Jan. 19, 1943. F, SEBALD FEED WATER HEATER Filed Aug. 31, 1940 2 Sheets-Sheet l W i H M j f Jan. 19, 1943. J. SEBALD FEED WATER HEATER Filed Aug. 31, 1940 2 Sheets-She't 2 INV N OR ATTORNEY Patented Jan. 19,

UNITED sTA'rss [PA ENT O-FFiCE 2,398,726 I v v FEED-WATEBHEATER Joseph F. Sebald, Arlington, N.

Wo Pump and 1., assignor to Machinery Corpora- 11 tion, Harrison, N. 5., a corporation of Delaware Application August 31, 1940.8erial No. 354,975

14 Claims. (01- 261-111) This invention relates to improvements in apparatus for heating and degasiiying liquids, and more particularly to an improved apparatus for heating and deaerating water for boiler feedservice and other services or purposes requiring practically oxygen free water.

An object of the present invention is the pro-'- vision of an improved apparatus for Providing a high degree of heating and degasiflcation wherein the apparatus employed, while' giving a very high degree of heating and degasiflcation, will compare favorably with heaters of comparable capacity, of other approved types, as to size,

weight and cost of manufacture.

' The present invention embodies the some new and advantageous feature of intimate mixing of the steam and water to provide improved heating then passes downwardly in this compartment 8 and desasliying of the water-as is set forth in my I companion application, Serial No. 354,974, and differs from the method and apparatus set forth in that application fundamentally in the steps or cycle of heating the water; reboiling or flashing for initial degasiflcation; second stage heating of the water by intimate mixing of the steam and water; and final reboiling or flashing for final degasiflcation of the water.

with these and other objects in view, as mayappear from the accompanying specification, the

invention consists of various features of construction and combination or parts, which will be first g described in connection with the accompanying drawings, showing a feed water heater of the preferred form embodying the invention, and the prises a shell i, which has a cylindrical partition 2 therein spaced from the inner surface of the shell I. A dome-like partition I is mounted within the enclosure formed by the circular partition 2 and forms an initial heating chamber 4, into which the water to be treated issprayed in a fineLv divided form by a plurality of spray valves 5, of any approved type commonly used in open type deaerating feed water heating apparatus.

The water to be treated passes to the spray valves 5 through a suitable inlet 5. f

The dome-like partition 2 has its lower edge extending into a trough-like structure I which,

water seal between the initial heating compartment 4 and the initial deaerating compartment 9. The water passes through the water seal 1 and over the upper edge of the circular wall it of the water seal into the compartment 9. It

and the lower inclined portions of the partition V 2 which form the water collection space H.

The steam first enters the feed water heatin 5 apparatus through the inlet pipe ii, which extends axially through the water collection space it and opens out at its lower end into the mixing space II. The lower, outer end of the steam inlet member or pipe I6 is curved upwardly and outwardly. as shown at H, so that water through theopening l2 will be guided into the space I4 in a direction parallel to the passage of the steam, upwardly through the mixing space II. The steamvand water will thoroughly and intimately mix in the mixing space ll providinga high degree of heating of the water. As clearly shown in Figure 1 of the drawings, the space I l gradually increases in cross-sectional area from the point of entrance of the steam and water through to its outlet 'end it, resulting in a lowering of the pressure duringtravel of the mixed steam and water through the passage ll.

mixed steam and water are projected from the outlet ll into the interior of the shell I at a point where the pressure is lower than the pressure in the mixing passage. This results in a reboiling or flashing oipart of the water and com; plete separation of the water, oxygen and noncondensable gases, together with the non-condensed steam. A splash plate 20 may be pro-' vided, spaced properly from the outlet ll so as to prevent the water from splashing into the annular passage 2i within the shell and about the outer surface of the partition 2. This stage. Just described, is the final stage of heating and deaeration oi the water, and the water falls from the space into which it is projected from the passage is into the storage space 2201 the heater. ongen and gases pass upwardly into the passage 2| and through the opening 23 in thetop of the Partition 2 into the initial heating chamber 4,

The

The non-condensed steam and separated where they contact the water being sprayed into the compartment 4, entering the compartment in a path transversally of the path of flow o! the water. This provides the initial heating step in the cycle of heating and degasifying the water to be treated. The partially heated water, together with non-condensed steam and gases, passes through the water seal 1, providing a short, thorough mixing passage where the water and the steam will intimately mix and pass out through the water seal into the initial or first deaeration chamber 9. This chamber 9 will be at a lower pressure than the pressure maintained in the water seal 1, with the result that a part of the water will reboil or flash in the chamber 9, providing the initial or first step or stage of deaeration oi the water. The gas separated from the water in this initial stage compartment, together with the gases which were released by the final deaeration step or stage occasioned by the projection of the water and steam from the mixing passage :4, togetherwith any non-condensed I with the return 01 the non-condensed steam and separated gases to the initial deaeration chamber.

irom which they are drawn ofl.

.A spring loaded check valve-2O is shown as mounted in the mouth or outlet of the steam inlet pipe I. This check valve serves to prevent a back flow of water through the steam inlet at such times as there is no flow of steam, or when the flow of steam is of such nature as to permit the back flow of water. This check valve may be of any approved time. and need not necessarily be mounted in the outlet of the steam inlet pipe, but may be placed at any convenient location in the pipe.

It will be understood that the invention is not to be limited to the specific construction or arrangement of parts shown, but that they may be widely modified within the invention defined by the claims.

' What is claimed is:

'1. Water heating and deaerating apparatus comprising in combination, a shell, means in the shell iorming an initial heating chamber, means for passing water into said chamber, awater seal at the outlet or said chamber, means in said shell forming a low pressure flashing chamber at the outlet of said initial heating chamber, an inlet tor steam, means in said shell taming a sure flashing chamber at the outlet of said initial heating chamber, an inlet for steam, means in said shell forming a confined mixing passage for receiving water from said flashing chamber and steam from said initial inlet and thoroughly mix. ing the steam and water during their flow through the passage, said passage discharging into the shell in a low pressure space to provide a second flashing or the water and final deaeration thereof, and means for directing non-condensed steam and released gases from the point of final deaeration into said initial heating chamber.

3. Water heating and deaerating apparatus comprising in combinatioma shell, means in the shell forming an initial heating chamber, means for passing water in a finely divided form into said chamber, a water seal at the outlet of said chamber, means in said shell forming a low pressure flashing chamber at the outlet of said initial heating chamber, an inlet for steam, means in said shell forming a confined mixing passage for receiving water from said flashing chamber and steam from said initial inlet and thoroughly mixing the steam and water during their flow through the passage, said passage discharging into the shell in a low pressure space exteriorly of said mixing passage to provide a second flashing of the water and final deaeration'thereoi. and means for directing non-condensed steam and released gases from the point at final deaeration into said initial heating chamber at a point re- -mote from the water outlet of the initial heating chamber and in a flow direction transverse- 1y of the direction of entrance fiow of water into the chamber.

' 4. Water heating and deaerating apparatus comprising in combination, a shell, means in the shell forming an initial heating chamber, means I for passing water in a finely divided form into said chamber, a water seal at the outlet of said chamber, means in said shell forming a low pressure flashing chamber at the outlet of said iniconfined mixing passage for receiving water from said'fiashing chamber and steam from said initial inlet, and thoroughly mixing the steam and water during their flow through said passage.

said passagedischarging into the shell in a low the water and final deaeration thereof.

2. Water heating and deaerating apparatus comprising in combination, a shell. means in the I said chamber, a water seal at the outlet of said pressilrespaceto-provisleasecondfiashingo tial heating chamber, an inlet for steam, means in said shell forming a confined mixing passage for receiving water from said flashing chamber and steam from said initial inlet and thoroughly mixing thesteam and water during their flow through the passage, said passage discharging into the shell in a low pressure space exteriorly of said mixing passage to provide a second flashing of the water-and final deaeration thereof. means for directing non-condensed steam and released gases from the point of final deaeration' into said initial heating chamber, and an outlet for non-condensed steam and released gases open- 1118 into said initial flash chamber. I

5. Water heating and deaerating apparatus comprising in combination, a shell, means in the shell iorming an initial heating-chamber, means tor-passing water in a finely divided form into said chamber, a water seal at the outlet of said chamber. means in said shell forming a low pressure flashing chamber at the outlet of said. imtialheating chamber, an inlet for steam. means in said shell forming a confined mixing passage for receiving water from said flashing chamber and steam from said initial inlet, thoroughly mixing the steam and water during their flow through said passage. said Passage discharging into the shell in a low prcssure'space exterior-1y of said mixing passageto provide a second flashing or the water and final deeeration thereof, the means forming said mixing passage being arranged to chamber, means in said shell forming a low presi- 751cm a passage oi gradually increasing cross- Y charge end.

asosnao sectional area from its entrance end to its dis- 8. Water heating and deaerating. apparatus comprising in combination, a shell, means in the shell iorming an initial heating chamber, means for passing water in-a finely divided form into said chamber, a waterseal at the outlet of said chamber, means in said shell forming a. low pressure flashing chamber at the outlet oi said initial heating chamber, an inlet for steam, means in said shell forming a-confined mixing passage for receiving water from said flashing chamber and steam from said initial inlet and thorou hly mixing the steam and water during their flow through said passage, said passage discharging into the shell in a low pressure space exteriorly said mixing passage to provide a second flashreleased non-condensible gases opening into said first low pressure flashing chamber. a i

10. In a water heating and deaerating P -r ratus, an initial treatment chamber, means for introducing water into said initial treatment.

, second low pressure flashing chamber, means ing of the water and final deaeration thereof. 7

the means forming said mixing passage being arranged to iorm a passage of gradually increasing cross-sectional area from its entrance end to its discharge end, and means for directing the steam and water into said mixing passage in substantially parallel flow directions.

7. Water heating and deaerating apparatus comprising in combination, a shell, means in the shell forming an initial heating chamber, means for passing water in a. finely divided form into said chamberpa water seal at the outlet oi said chamber, means in said shell forming, a, low pressure flashing chamber at the outlet of said initial heating chamber, an inlet for steam,

means in said shell forming a confined mixing passage for receiving water from said flashing chamber and steam from saidinitial inlet and,

thoroughly mixing the steam and water during their flow through said passage, said passage discharging into the shell in a low pressure space exteriorly 013- said mixing passage to provide a.

and thoroughly mixing the steam and water during their flow through the passage, said passage discharging the mixed steam and water into said second flashing chamber, said steam introducing means passing through said first low pressure flashing chamber and constructed and arranged to maintain the incoming steam and the water in said first low pressure flashing chamber in separated heat' exchange relationship; and outlet means for non-condensed vapor and released non-condensible gases opening into receiving partially treated water from said initial treatment chamber, steam introducing means, 1

a second low pressure flashing chamber, means ,i'orming a confined mixing passage for receiving water from said first low pressure flashing chamber and steam from said steam introducing means and thoroughly mixing the steam and water during their flow through the passage, said passage dischargin the mixed steam and water into said second flashing chamber.

9. In a water heating and deaerating apparatus, an initial treatment chamber, means for introducing water into said initial treatment chamber, a first low pressure flashing chamber receiving partially treated water irom said initial treatment chamber, steam introducing means, a second low pressure flashing chamber,

means forming a confined mixing passage for I said first low pressure flashing chamber.

11. In a water heating and deaerating appa ratus, an initial treatment chamber, means for introducing water into said initial treatment chamber, a first low pressure flashing chamber receiving partially treated water from said initial treatmentchamber, steam introducing means, a second low pressure flashing chamber, means forming a confined mixing passage for receiving water from said first low pressure flashing cham- Y ber and steam from said steam introducin determined degree.

12. In a'water heating and deaerating appa-v ratus, an initial treatment chamber, means for introducing water into said initial treatment chamber, a first low pressure flashing chamber receiving partially treated water from said initial treatment chamber, steam introducing means, a

second low pressure flashing chamber, means forming a confined mixing passage for receivin water from said first low pressure flashing cham-' ber and steam from said 'steam introducing means and thoroughly mixing the steam and water during their flow through the passage, said passage discharging the mixed steam and water into said second flashing chamber, and means for directing non-condensed steam and released n'on-condensible gases from said second low pressure flashing chamber into said initial treatment. chamber.

13. In a water heating and deaerating apparatus, an initial treatment chamber, means for introducing water into said initial treatment chamber, a first low pressure flashing chamber receiving partially treated water from said initial treatment chamber, steam introducing means, a second low pressure flashing chamber, means forming a confined mixing passage for receiving water from said first low pressure flashing chamber and steam from said steam introducing means and thoroughly mixing the steam and water during their flow through the passage, said passage discharging the mixed steam and water into said second flashing chamber, means for directing non-condensed steam and released non-con treatment chamber, steam introducing means, a

second low pressure flashing chamber, means forming a confined mixing passage for receiving water from said flrst low pressure flashing chamber and steam irom said steam introducins means and thoroughly mixing the steam and water during their flow through the passage, said passage discharging the mixed steam and water into said second flashing chamber, said steam introducing means passing through said flrst low pressure flashing chamber and constructed and arranged to maintain the incoming steam and the water in said first low pressure flashing chamber in separated heat exchange relationship. and a flange on the outlet end of said steam introducing means for directing the steam and water into said mixing passage in substantially parallel flow directions.

JOSEPH I. SEBALD. 

